CN113960767A

CN113960767A - Imaging lens, camera module and electronic device

Info

Publication number: CN113960767A
Application number: CN202111403533.0A
Authority: CN
Inventors: 黄有执; 蔡谆桦
Original assignee: Largan Precision Co Ltd
Current assignee: Largan Precision Co Ltd
Priority date: 2018-08-17
Filing date: 2018-10-23
Publication date: 2022-01-21
Anticipated expiration: 2038-10-23
Also published as: US11714251B2; US20210405317A1; TW202009548A; US11150433B2; TWI671548B; CN110837176B; CN110837176A; KR20210107580A; US20200057234A1; KR102420243B1; CN113960767B; KR102295162B1; KR20200020591A; BR102019016045A2

Abstract

The invention discloses an imaging lens, a camera module and an electronic device. The imaging lens comprises a plastic lens cone and an imaging lens group, wherein the imaging lens group is arranged in the plastic lens cone, has an optical axis, and comprises an object side lens and an image side lens, wherein the object side lens is provided with an outer diameter surface and an optical effective part, and comprises a conical collimation surface. The conical collimation surface is positioned on the image side surface of the object side lens and is used for being coaxially aligned and connected with the image side lens. When specific conditions are satisfied, both assembly stability and image quality can be achieved. The invention also discloses a camera module with the imaging lens and an electronic device with the camera module.

Description

Imaging lens, camera module and electronic device

The present application is a divisional application of patent applications having application dates of 2018, 10 and 23, application number of 201811234241.7, and title of "imaging lens, camera module, and electronic device".

Technical Field

The present invention relates to an imaging lens and a camera module, and more particularly, to an imaging lens and a camera module applied to a portable electronic device.

Background

In recent years, portable electronic devices, such as smart electronic devices and tablet computers, have been developed rapidly, and people live in their lives, and imaging lenses mounted on the portable electronic devices have been developed rapidly. However, as the technology is further advanced, the quality of the imaging lens required by users is higher, so that the quality of the imaging lens is improved in terms of optical design, and the manufacturing and assembling precision is also improved.

In the manufacturing and assembling processes of the imaging lens, the relative arrangement relationship between the lens barrel and the lens and between the lens and the lens often affects the assembly of the imaging lens and the imaging quality of the imaging lens, and if the lens is provided with a structure for connection in cooperation with other lenses or lens barrels, the structure is easy to cause the generation of stray light during imaging, and affects the imaging quality on the contrary. Therefore, it is a great objective in the industry to develop an imaging lens with both assembly stability and imaging quality.

Disclosure of Invention

The imaging lens, the camera module and the electronic device provided by the invention can ensure the coaxiality of the optical axis of the imaging lens group in the lens on the premise of designing the conical collimation surface, and take the assembly stability and the imaging quality into consideration.

The present invention provides an imaging lens assembly, including a plastic lens barrel and an imaging lens group, wherein the imaging lens group is disposed in the plastic lens barrel, the imaging lens group has an optical axis, and includes an object-side lens and an image-side lens, wherein the object-side lens has an outer diameter surface and an optical effective portion, and includes a conical collimating surface, an image-side bearing surface, a parting line and an annular surface-reducing structure. The conical collimation surface is positioned on the image side surface of the object side lens and is used for being coaxially aligned and connected with the image side lens. The parting line has an annular step mark surrounding the optically effective portion, wherein the parting line is located between the outer diameter surface and the image-side bearing surface. The annular surface reducing structure is positioned between the outer diameter surface and the conical collimation surface. The image side lens further comprises a first surface-reducing structure facing the annular surface-reducing structure of the object side lens. The shortest radial distance between the minimum diameter position of the conical collimating surface and the outer diameter surface is L1, the depth of the annular step-down structure parallel to the optical axis is s1, and the depth of the first step-down structure parallel to the optical axis is s2, which satisfies the following conditions: 0.03mm < L1<0.28 mm; and 0.005mm < s1+ s2<0.035 mm. Therefore, the surface reflection condition of the stray light in the lens can be effectively controlled, the imaging quality is improved, and the assembly stability is considered.

The imaging lens assembly of the preceding paragraph, wherein the image side lens element includes an object side bearing surface, wherein the image side bearing surface overlaps the object side bearing surface, and the image side bearing surface is further away from the optical effective portion than the conical collimating surface.

An imaging lens according to the previous paragraph, wherein the annular land structure has a land depth parallel to the optical axis of s1 and the first land structure has a land depth parallel to the optical axis of s2, satisfying the following conditions: s1< s 2. In addition, it satisfies the following conditions: 0.005mm < s1+ s2<0.02 mm.

An imaging lens according to the preceding paragraph, wherein the shortest radial distance between the smallest diameter of the conical collimating surface and the outer diameter surface is L1, which satisfies the following condition: l1 is more than 0.03mm and less than or equal to 0.23 mm.

An imaging lens according to the preceding paragraph, wherein the shortest radial distance between the optically effective portion and the smallest diameter of the conical collimating surface is L0, which satisfies the following condition: 0.2mm < L0.

The imaging lens according to the preceding paragraph, wherein the outer diameter of the plastic barrel closest to the object end is Φ oo, which satisfies the following condition: 1.05mm < Φ oo <3.05 mm.

The imaging lens assembly as defined in the preceding paragraph, wherein the imaging lens assembly includes at least four lens elements, the at least four lens elements include the object-side lens element and the image-side lens element, and a lens element closest to the image-side lens element of the at least four lens elements has a thickness that varies from a smaller thickness to a smaller thickness from a center to an edge.

An imaging lens according to the previous paragraph, wherein a depth of a land of the annular land structure parallel to the optical axis is s1, which satisfies the following condition: s1<0.015 mm. In addition, the following conditions are more satisfied: s1<0.01 mm.

The imaging lens according to the preceding paragraph, wherein an angle between the conical collimating surface and the optical axis is θ, which satisfies the following condition: 2 degrees < theta <30 degrees.

The invention provides a camera module comprising the imaging lens.

According to an embodiment of the present invention, an electronic device includes the camera module and an electronic photosensitive element disposed on an image plane of the camera module.

The electronic device according to the preceding paragraph, wherein the pixel size of the electronic photosensitive element is p, which satisfies the following condition: 0.1um < p <0.95 um.

The present invention provides an imaging lens assembly, including a plastic lens barrel and an imaging lens group, wherein the imaging lens group is disposed in the plastic lens barrel, the imaging lens group has an optical axis, and includes an object-side lens and an image-side lens, wherein the object-side lens has an outer diameter surface and an optical effective portion, and includes a conical collimating surface, an image-side bearing surface, a parting line and an annular surface-reducing structure. The conical collimation surface is positioned on the image side surface of the object side lens and is used for being coaxially aligned and connected with the image side lens. The parting line has an annular step mark surrounding the optically effective portion, wherein the parting line is located between the outer diameter surface and the image-side bearing surface. The annular surface reducing structure is positioned between the outer diameter surface and the conical collimation surface. The image side lens further comprises a first surface-reducing structure facing the annular surface-reducing structure of the object side lens. The shortest radial distance between the minimum diameter position of the conical collimating surface and the outer diameter surface is L1, the depth of the annular step-down structure parallel to the optical axis is s1, and the depth of the first step-down structure parallel to the optical axis is s2, which satisfies the following conditions: 0.03mm < L1<0.28 mm; and s1< s 2. Therefore, the surface reflection condition of the stray light in the lens can be effectively controlled, the imaging quality is improved, and the assembly stability is considered.

Drawings

FIG. 1A is a schematic view of an electronic device according to a first embodiment of the invention;

FIG. 1B is a schematic view illustrating an object-side lens and an image-side lens of the electronic device in accordance with the first embodiment of FIG. 1A;

FIG. 1C is a schematic view illustrating a state where an object-side lens and an image-side lens of the electronic device in accordance with the first embodiment of FIG. 1A are mounted in a lapped manner;

FIG. 2A is a schematic view of an electronic device according to a second embodiment of the invention;

FIG. 2B is a schematic view illustrating an object-side lens and an image-side lens of the electronic device in accordance with the second embodiment of FIG. 2A;

FIG. 2C is a schematic view illustrating a state where an object-side lens and an image-side lens of the electronic device in accordance with the second embodiment of FIG. 2A are mounted in a lapped manner;

FIG. 3A is a schematic view of an electronic device according to a third embodiment of the invention;

FIG. 3B is a schematic view illustrating an object-side lens and an image-side lens of the electronic device in accordance with the third embodiment of FIG. 3A;

FIG. 3C is a schematic view illustrating a state where an object-side lens and an image-side lens of the electronic device in accordance with the third embodiment of FIG. 3A are mounted in a lapped manner;

FIG. 4A is a schematic view of an electronic device according to a fourth embodiment of the invention;

FIG. 4B is a schematic view illustrating an object-side lens and an image-side lens of the electronic device in accordance with the fourth embodiment of FIG. 4A;

FIG. 4C is a schematic view illustrating a state where the object-side lens and the image-side lens of the electronic device in accordance with the fourth embodiment of FIG. 4A are mounted in a lap joint manner;

FIG. 5A is a schematic view of an electronic device according to a fifth embodiment of the invention;

FIG. 5B is another schematic view of the electronic device in the fifth embodiment;

FIG. 5C is a block diagram of an electronic device according to a fifth embodiment;

FIG. 6 is a schematic view of an electronic device according to a sixth embodiment of the invention; and

fig. 7 is a schematic view illustrating an electronic device according to a seventh embodiment of the invention.

[ notation ] to show

An electronic device: 10. 20, 30, 40, 50, 60, 70

A camera module: 51. 61, 71

An electron-sensitive element: 11. 21, 31, 41, 52

An auto-focus assembly: 53

Optical anti-shake subassembly: 54

A sensing element: 55

Auxiliary optical element: 56

A user interface: 58

Touch screen: 58a of the formula

Pressing a key: 58b

An imaging signal processing element: 57

A flexible circuit board: 59a of

A connector: 59b

A plastic lens barrel: 12. 22, 32, 42

An object-side lens: 110. 210, 310, 410

Outer diameter surface: 111. 211, 311, 411

An optically effective portion: 112. 212, 312, 412

Conical collimation surface: 113. 213, 313, 413

The annular surface-falling structure: 114. 214, 314, 414

An image side bearing surface: 115. 215, 315, 415

Parting line: 116. 126, 216, 226, 316, 326, 416, 426

An image side lens: 120. 220, 320, 420

The first plane lowering structure: 121. 221, 421

Object side bearing surface: 122. 222, 322, 422

A third lens: 130. 230, 330, 430

A fourth lens: 140. 240, 340, 440

A fifth lens: 150. 250, 350, 450

A filter element: 160. 260, 360

Imaging surface: 170. 270, 370, 470

Optical axis: x

And (3) stripping position: m1 and M2

L1: the shortest radial distance between the minimum diameter position of the conical collimating surface and the outer diameter surface

L0: the shortest radial distance between the minimum diameter position of the conical collimation surface and the optical effective part

s 1: the annular surface-falling structure is parallel to the surface-falling depth of the optical axis X

s 2: the first plane-falling structure is parallel to the plane-falling depth of the optical axis X

θ: angle between the conical collimating surface and the optical axis X

Φ oo: outer diameter of plastic lens cone closest to object end

p: pixel size of electronic photosensitive element

Detailed Description

An imaging lens comprises a plastic lens barrel and an imaging lens group, wherein the imaging lens group is arranged in the plastic lens barrel, has an optical axis and comprises at least one object side lens and at least one image side lens, and each object side lens is correspondingly connected with the adjacent image side lens.

The object side lens has an outer diameter surface and an optical effective part and comprises a conical collimation surface. The conical collimation surface is positioned on the image side surface of the object side lens and is used for being coaxially aligned and connected with the image side lens. The shortest radial distance between the smallest diameter position of the conical collimating surface and the outer diameter surface is L1, which satisfies the following condition: 0.03mm < L1<0.28 mm. Accordingly, the present invention provides a lens design and manufacture that can achieve both imaging quality and assembly stability, and ensure the coaxiality of the optical axes of the imaging lens assembly on the premise of designing the conical collimating surface. According to the invention, through a large number of optical path simulation and various assembly test products, the object-side lens meeting the L1 condition is developed, the surface reflection condition of stray light inside the object-side lens can be effectively controlled, and when the L1 is too large, excessive stray light is reflected back to an imaging surface through the conical collimating surface, so that the imaging quality is influenced; when L1 is too small, the assembly stability of the imaging lens assembly is easily affected by external forces, and the coaxiality of the optical axes of the imaging lens assembly is prone to generate unacceptable errors. Preferably, the following conditions are satisfied: l1 is less than or equal to 0.23 mm. Therefore, the value of the parameter L1 can be configured more accurately, and the stray light is controlled more ideally.

The object-side lens may further include an image-side bearing surface, wherein the image-side bearing surface is overlapped with the object-side bearing surface, and the image-side bearing surface is farther from the optical effective part than the conical collimating surface. In detail, the image-side bearing surface and the object-side bearing surface both extend mainly along a direction perpendicular to the optical axis, so that adjacent object-side lenses and image-side lenses are supported with each other to maintain the imaging quality and the assembly stability.

The object-side lens can further include a mold split line having an annular step mark surrounding the optical effective portion, wherein the mold split line is located between the outer diameter surface and the image-side bearing surface. By the arrangement of the parting line, the dimensional accuracy of the object side lens can be improved.

The object-side lens may further include an annular step-down structure located between the outer diameter surface and the conical collimating surface, wherein a step-down depth of the annular step-down structure parallel to the optical axis is s1, which satisfies the following condition: s1<0.015 mm. By matching with the parameter L1, a tiny annular surface-descending structure is configured, so that the common burr interference of the lens can be effectively reduced, the assembly stability can be ensured, and the stray light can not cause the optical quality to bear unpredictable influence due to burr factors. Preferably, the following conditions are satisfied: s1<0.01 mm.

The image side lens element may comprise a first planar structure facing the annular planar structure of the object side lens element, wherein a planar depth of the annular planar structure parallel to the optical axis is s1, and a planar depth of the first planar structure parallel to the optical axis is s2, satisfying the following condition: 0.005mm < s1+ s2<0.035 mm. By providing the object-side lens and the image-side lens with corresponding surface-down structures, the structural interference during assembly can be reduced, and the parameter L1 can be maintained within a proper range. Preferably, the following conditions are satisfied: 0.005mm < s1+ s2<0.02 mm. In addition, the following conditions may be satisfied: s1< s 2. Therefore, the situation of structural interference can be further improved.

The shortest radial distance between the minimum diameter of the conical collimating surface and the optically effective portion is L0, which satisfies the following condition: 0.2mm < L0. Therefore, the parameter L0 is maintained in a specific value range, the reflection condition of the non-imaging light inside the object side lens can be controlled, and enough space can be provided for adding a shading sheet according to the requirement; if the parameter L0 is too small, the non-imaging light with higher intensity will pass through the conical collimating surface directly, which directly causes the light damage that cannot be compensated.

The outer diameter of the plastic lens cone closest to the object end is phi oo, and the outer diameter meets the following conditions: 1.05mm < Φ oo <3.05 mm. Therefore, the configuration of the parameter L1 is matched to improve the effect of shielding stray light outside the lens.

The included angle between the cone collimation surface and the optical axis is theta, and the following conditions are satisfied: 2 degrees < theta <30 degrees. Therefore, the stability and the imaging quality of lens assembly can be improved, and the reflecting situation of stray light is more serious due to an overlarge angle, so that the assembly stability is poorer; an excessively small angle makes the coaxiality of the optical axis difficult to correct, and there is an optical axis deviation that cannot be corrected.

In the prior art, in order to ensure the precision requirement of the coaxiality of the optical axis, the assembling method is to assemble each lens of the imaging lens group and then place the lens into the plastic lens barrel, but the assembling method has higher difficulty and is more complex. In the imaging lens of the invention, the outer diameter surface of the object side lens can be directly contacted with the plastic lens barrel. The object side lens is assembled in the plastic lens barrel in a direct contact mode through the object side lens and the plastic lens barrel, so that only acceptable offset errors exist between the plastic lens barrel and other lenses, and the lenses assembled subsequently are not affected by the offset errors.

In addition, the imaging lens assembly can include at least four lens elements, wherein the at least four lens elements include an object side lens and an image side lens, and a lens element closest to the image side of the at least four lens elements has a thickness, and the thickness varies from small to large and then becomes small from the center to the edge. Therefore, the situation that stray light possibly generates total reflection in the lens can be effectively eliminated.

All technical features of the imaging lens can be combined and configured to achieve corresponding effects.

The invention further provides a camera module comprising the imaging lens. Therefore, the camera module with imaging quality and assembly stability is provided.

The invention further provides an electronic device including the camera module and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the camera module. Therefore, the electronic device with imaging quality and assembly stability is provided.

In addition, in the electronic device, the pixel size of the electronic photosensitive element is p, and the following condition can be satisfied: 0.1um < p <0.95 um. Therefore, the finer pixel size can more completely reflect the high-quality optical performance and the fine light influence, so that the improved parameter L1 characteristic can be represented by a better electronic photosensitive element.

The following provides a detailed description of the embodiments with reference to the accompanying drawings.

< first embodiment >

Fig. 1A is a schematic diagram of an electronic device 10 according to a first embodiment of the invention. As shown in fig. 1A, the electronic device 10 includes a camera module (not numbered), and an electrophotographic photosensitive element 11, wherein the electrophotographic photosensitive element 11 is disposed on an image plane 170 of the camera module. The camera module includes an imaging lens (not shown), which includes a plastic barrel 12, an imaging lens set (not shown) disposed in the plastic barrel 12, and a filter element 160 disposed on an image side of the plastic barrel 12. The imaging lens assembly has an optical axis X and includes at least four lens elements, and in the first embodiment, the imaging lens assembly includes five lens elements, in order from an object side to an image side, a first lens element, a second lens element, a third lens element 130, a fourth lens element 140 and a fifth lens element 150, wherein the first lens element is the object side lens element 110 and the second lens element is the image side lens element 120.

Referring to fig. 1B and fig. 1C, wherein fig. 1B is a schematic diagram illustrating an object-side lens 110 and an image-side lens 120 of the electronic device 10 according to the first embodiment of fig. 1A, and fig. 1C is a schematic diagram illustrating a lap joint state of the object-side lens 110 and the image-side lens 120 of the electronic device 10 according to the first embodiment of fig. 1A. As can be seen from fig. 1B and 1C, the object-side lens 110 and the image-side lens 120 are overlapped and connected, and no lens is disposed between the object-side lens 110 and the image-side lens 120. In addition, the lens closest to the image side of the five lenses (i.e., the fifth lens element 150 in the first embodiment) has a thickness that varies from small to large and then decreases from the center to the edge.

In detail, the object-side lens 110 has an outer diameter surface 111 and an optical effective portion 112, wherein the outer diameter surface 111 is farther from the optical axis X than the optical effective portion 112, and the outer diameter surface 111 of the object-side lens 110 directly contacts the plastic lens barrel 12. The object-side lens 110 includes a conical collimating surface 113 and an annular step-down structure 114, wherein the conical collimating surface 113 is disposed between the outer diameter surface 111 and the optically effective portion 112, and the annular step-down structure 114 is disposed between the outer diameter surface 111 and the conical collimating surface 113. The conical collimating surface 113 is located on an image-side surface (not numbered) of the object-side lens 110 and coaxially aligned with the image-side lens 120, wherein the conical collimating surface 113 is inclined from the outer diameter surface 111 toward the object-side of the object-side lens 110 toward the direction of the optically effective portion 112; that is, the conical collimating surface 113 forms a structure gradually shrinking from the outer diameter surface 111 to the optical effective portion 112 on the image-side surface of the object-side lens 110. In addition, the conical collimating surface 113 is an annular surface with a smooth surface.

The image side lens element 120 includes a first surface-relief structure 121 facing the annular surface-relief structure 114 of the object side lens element 110, such that a concave structure is formed between the annular surface-relief structure 114 and the first surface-relief structure 121 between the object side lens element 110 and the image side lens element 120.

In addition, the object-side lens 110 may further include an object-side bearing surface 115, and the image-side lens 120 may further include an object-side bearing surface 122, wherein the image-side bearing surface 115 overlaps the object-side bearing surface 122, and the image-side bearing surface 115 is farther from the optical effective portion 112 than the conical collimating surface 113. Thus, the image quality and the assembly stability can be maintained.

Referring to fig. 1B, the object-side lens 110 may further include a mold-splitting line 116 having an annular step mark (not numbered) surrounding the optical effective portion 112, wherein the mold-splitting line 116 is located between the outer diameter surface 111 and the image-side bearing surface 115. In fig. 1B, the object-side lens 110 and the image-side lens 120 have mold-release positions M1 and M2, respectively, which represent the mold-release positions of the object-side lens 110 and the image-side lens 120, and indicate the material-injection spaces formed by the molds with different structures. In detail, the parting line 116 refers to a mark of a surface step difference between the molds at the object-side lens 110 when the molds are separated at a parting stage according to the mold design in the manufacturing process of the plastic lens (i.e., the object-side lens 110). The parting line 116 is further from the image-side bearing surface 115 than the annular step-down structure 114; that is, the annular step-down structure 114 is located between the parting line 116 and the image-side bearing surface 115. The parting line 116 is further from the conical collimating surface 113 than the annular step-down structure 114; that is, the annular step-down structure 114 is located between the parting line 116 and the conical collimating surface 113. The parting line 116 is farther from the conical collimating surface 113 than the image-side bearing surface 115; that is, the image-side bearing surface 115 is located between the parting line 116 and the conical collimating surface 113. In addition, image side lens 120 may further include a split line 126 having an annular step mark (not further numbered).

With reference to fig. 1A, 1B and 1C, in the first embodiment, the shortest radial distance between the minimum diameter of the conical collimating surface 113 and the outer diameter surface 111 is L1, which is the distance perpendicular to the optical axis X between the minimum diameter of the conical collimating surface 113 and the outer diameter surface 111; the shortest radial distance between the minimum diameter position of the conical collimating surface 113 and the optically effective part 112 is L0, which is the distance perpendicular to the optical axis X between the minimum diameter position of the conical collimating surface 113 and the optically effective part 112; the annular step-down structure 114 has a step-down depth s1 parallel to the optical axis X; the depth of the first land structure 121 parallel to the optical axis X is s 2; the included angle between the conical collimating surface 113 and the optical axis X is theta; the outer diameter of the plastic lens barrel 12 closest to the object end is phi oo; the pixel size of the electron-sensitive element 11 is p, and the parameters satisfy the following condition.

< second embodiment >

Fig. 2A is a schematic diagram of an electronic device 20 according to a second embodiment of the invention. As shown in fig. 2A, the electronic device 20 includes a camera module (not numbered), and an electrophotographic photosensitive element 21, wherein the electrophotographic photosensitive element 21 is disposed on an image plane 270 of the camera module. The camera module includes an imaging lens (not shown), which includes a plastic lens barrel 22, an imaging lens set (not shown) disposed in the plastic lens barrel 22, and a filter element 260 disposed at an image side of the plastic lens barrel 22. The imaging lens assembly has an optical axis X and includes at least four lens elements, in the second embodiment, the imaging lens assembly includes five lens elements, in order from an object side to an image side, a first lens element, a second lens element, a third lens element 230, a fourth lens element 240 and a fifth lens element 250, wherein the first lens element is the object side lens element 210 and the second lens element is the image side lens element 220.

Referring to fig. 2B and fig. 2C, wherein fig. 2B is a schematic diagram illustrating the object-side lens 210 and the image-side lens 220 of the electronic device 20 according to the second embodiment of fig. 2A, and fig. 2C is a schematic diagram illustrating a lap joint state of the object-side lens 210 and the image-side lens 220 of the electronic device 20 according to the second embodiment of fig. 2A. As can be seen from fig. 2B and 2C, the object-side lens 210 and the image-side lens 220 are overlapped with each other, and no lens is disposed between the object-side lens 210 and the image-side lens 220. In addition, the lens closest to the image side of the five lenses (the fifth lens 250 in the second embodiment) has a thickness, and the thickness varies from small to large and then becomes small from the center to the edge.

In detail, the object-side lens 210 has an outer diameter surface 211 and an optical effective portion 212, wherein the outer diameter surface 211 is farther from the optical axis X than the optical effective portion 212, and the outer diameter surface 211 of the object-side lens 210 directly contacts the plastic barrel 22. The object-side lens 210 includes a conical collimating surface 213 and an annular step-down structure 214, wherein the conical collimating surface 213 is disposed between the outer diameter surface 211 and the optically effective portion 212, and the annular step-down structure 214 is disposed between the outer diameter surface 211 and the conical collimating surface 213. The conic collimating surface 213 is disposed on an image-side surface (not numbered) of the object-side lens 210 and coaxially aligned with the image-side lens 220, wherein the conic collimating surface 213 is tilted from the outer diameter surface 211 toward the effective optical portion 212 toward the object-side of the object-side lens 210; that is, the conical collimating surface 213 forms a structure gradually shrinking from the outer diameter surface 211 to the optical effective portion 212 on the image-side surface of the object-side lens 210. In addition, the conical collimating surface 213 is an annular surface with a smooth surface.

The image side lens 220 includes a first surface-relief structure 221 facing the annular surface-relief structure 214 of the object side lens 210, such that a concave structure is formed between the object side lens 210 and the image side lens 220 at a position corresponding to the annular surface-relief structure 214 and the first surface-relief structure 221.

In addition, the object-side lens 210 may further include an image-side supporting surface 215, the image-side lens 220 may further include an object-side supporting surface 222, wherein the image-side supporting surface 215 overlaps the object-side supporting surface 222, and the image-side supporting surface 215 is farther from the optical effective portion 212 than the conical collimating surface 213. Thus, the image quality and the assembly stability can be maintained.

In conjunction with fig. 2B, the object-side lens 210 may further include a mold split line 216 having an annular step mark (not otherwise labeled) surrounding the optical effective portion 212, wherein the mold split line 216 is located between the outer diameter surface 211 and the image-side bearing surface 215. In the second embodiment, the positional relationship between the mold parting line 216 and other structures on the object-side lens 210 is the same as that in the first embodiment, and therefore, the description thereof is omitted. In addition, the image side lens element 220 may further include a mold split line 226 having an annular step mark (not further labeled).

With reference to fig. 2A, fig. 2B and fig. 2C, the following two parameters are defined in the same way as in the first embodiment, and are not repeated herein.

< third embodiment >

Fig. 3A is a schematic diagram of an electronic device 30 according to a third embodiment of the invention. As shown in fig. 3A, the electronic device 30 includes a camera module (not numbered), and an electrophotographic photosensitive element 31, wherein the electrophotographic photosensitive element 31 is disposed on an image plane 370 of the camera module. The camera module includes an imaging lens (not shown), which includes a plastic lens barrel 32, an imaging lens set (not shown) disposed in the plastic lens barrel 32, and a filter element 360 disposed at an image side of the plastic lens barrel 32. The imaging lens assembly has an optical axis X and includes at least four lens elements, in the third embodiment, the imaging lens assembly includes five lens elements, in order from an object side to an image side, a first lens element 310, a second lens element 310, a third lens element 330, a fourth lens element 340 and a fifth lens element 350, wherein the second lens element is the image side lens element 320.

Referring to fig. 3B and 3C, wherein fig. 3B is a schematic view illustrating the object-side lens 310 and the image-side lens 320 of the electronic device 30 according to the third embodiment of fig. 3A, and fig. 3C is a schematic view illustrating a lap joint state of the object-side lens 310 and the image-side lens 320 of the electronic device 30 according to the third embodiment of fig. 3A. In fig. 3B and 3C, the object-side lens 310 and the image-side lens 320 are overlapped and connected, and no lens is disposed between the object-side lens 310 and the image-side lens 320. In addition, the lens closest to the image side of the five lenses (i.e., the fifth lens 350 in the third embodiment) has a thickness that varies from small to large and then decreases from the center to the edge.

Specifically, the object-side lens 310 has an outer diameter surface 311 and an optically effective portion 312, wherein the outer diameter surface 311 is farther from the optical axis X than the optically effective portion 312, and the outer diameter surface 311 of the object-side lens 310 directly contacts the plastic lens barrel 32. The object-side lens 310 includes a conical collimating surface 313 and an annular step-down structure 314, wherein the conical collimating surface 313 is disposed between the outer diameter surface 311 and the optically effective portion 312, and the annular step-down structure 314 is disposed between the outer diameter surface 311 and the conical collimating surface 313. The conical collimating surface 313 is located on an image-side surface (not shown) of the object-side lens 310 and coaxially aligned with the image-side lens 320, wherein the conical collimating surface 313 is inclined from the outer diameter surface 311 toward the object-side of the object-side lens 310 toward the optically effective portion 312; that is, the conical collimating surface 313 forms a structure gradually shrinking from the outer diameter surface 311 to the optical effective portion 312 on the image side surface of the object-side lens 310. In addition, the conical collimating surface 313 is an annular surface with a smooth surface.

In addition, the object-side lens 310 may further include an image-side supporting surface 315, and the image-side lens 320 may further include an object-side supporting surface 322, wherein the image-side supporting surface 315 is overlapped with the object-side supporting surface 322, and the image-side supporting surface 315 is farther from the optical effective portion 312 than the conical collimating surface 313. Thereby maintaining the image quality and the assembly stability.

In fig. 3B, the object-side lens 310 may further include a mold split line 316 having an annular step mark (not otherwise labeled) surrounding the optical effective portion 312, wherein the mold split line 316 is located between the outer diameter surface 311 and the image-side bearing surface 315. In the third embodiment, the positional relationship between the mold parting line 316 and other structures on the object-side lens 310 is the same as that in the first embodiment, and therefore, the description thereof is omitted. In addition, the image-side lens element 320 may further include a mold split line 326 having an annular step mark (not further labeled).

Referring to fig. 3A, fig. 3B and fig. 3C, the following three parameters are defined in the same way as in the first embodiment, and are not repeated herein.

< fourth embodiment >

Fig. 4A is a schematic diagram illustrating an electronic device 40 according to a fourth embodiment of the invention. As shown in fig. 4A, the electronic device 40 includes a camera module (not numbered), and an electrophotographic photosensitive element 41, wherein the electrophotographic photosensitive element 41 is disposed on an image plane 470 of the camera module. The camera module includes an imaging lens (not shown) including a plastic lens barrel 42 and an imaging lens set (not shown), wherein the imaging lens set is disposed in the plastic lens barrel 42. The imaging lens assembly has an optical axis X and comprises at least four lens elements, in the fourth embodiment, the imaging lens assembly comprises five lens elements, in order from an object side to an image side, the first lens element is an object side lens element 410, and the second lens element is an image side lens element 420.

Referring to fig. 4B and 4C, wherein fig. 4B is a schematic view illustrating the object-side lens 410 and the image-side lens 420 of the electronic device 40 according to the fourth embodiment of fig. 4A, and fig. 4C is a schematic view illustrating a lap joint state of the object-side lens 410 and the image-side lens 420 of the electronic device 40 according to the fourth embodiment of fig. 4A. In fig. 4B and 4C, the object-side lens 410 and the image-side lens 420 are overlapped with each other, and no lens is disposed between the object-side lens 410 and the image-side lens 420. In addition, the lens closest to the image side of the five lenses (i.e., the fifth lens 450 in the fourth embodiment) has a thickness that varies from small to large and then decreases from the center to the edge.

In detail, the object-side lens 410 has an outer diameter surface 411 and an optical effective portion 412, wherein the outer diameter surface 411 is farther from the optical axis X than the optical effective portion 412, and the outer diameter surface 411 of the object-side lens 410 is in direct contact with the plastic barrel 42. The object-side lens 410 includes a conical collimating surface 413 and an annular step-down structure 414, wherein the conical collimating surface 413 is disposed between the outer diameter surface 411 and the optically effective portion 412, and the annular step-down structure 414 is disposed between the outer diameter surface 411 and the conical collimating surface 413. The conical collimating surface 413 is disposed on an image-side surface (not numbered) of the object-side lens 410 and coaxially aligned with the image-side lens 420, wherein the conical collimating surface 413 is inclined from the outer diameter surface 411 toward the object-side of the object-side lens 410 toward the optical effective portion 412; that is, the conical collimating surface 413 forms a structure gradually shrinking from the outer diameter surface 411 to the optical effective portion 412 on the image-side surface of the object-side lens 410. In addition, the conical collimating surface 413 is an annular surface with a smooth surface.

The image side lens 420 includes a first surface-relief structure 421 facing the annular surface-relief structure 414 of the object side lens 410, such that a concave structure is formed between the annular surface-relief structure 414 and the image side lens 420 at a position corresponding to the first surface-relief structure 421 between the object side lens 410 and the image side lens 420.

In addition, the object-side lens 410 may further include an object-side bearing surface 415, the image-side lens 420 may further include an object-side bearing surface 422, wherein the object-side bearing surface 415 overlaps the object-side bearing surface 422, and the image-side bearing surface 415 is farther from the optical effective portion 412 than the conical collimating surface 413. Thereby maintaining the image quality and the assembly stability.

In fig. 4B, the object-side lens 410 may further include a mold split line 416 having an annular step mark (not otherwise labeled) surrounding the optical effective portion 412, wherein the mold split line 416 is located between the outer diameter surface 411 and the image-side bearing surface 415. In the fourth embodiment, the positional relationship between the mold parting line 416 and other structures on the object-side lens 410 is the same as that in the first embodiment, and therefore, the description thereof is omitted. Image-side lens element 420 may further include a split line 426 having an annular step mark (not shown).

With reference to fig. 4A, 4B and 4C, the following four parameters are defined in the same way as in the first embodiment, and are not repeated herein.

< fifth embodiment >

Referring to fig. 5A and 5B in combination, wherein fig. 5A is a schematic view of an electronic device 50 according to a fifth embodiment of the invention, and fig. 5B is another schematic view of the electronic device 50 according to the fifth embodiment. As can be seen from fig. 5A and 5B, the electronic device 50 of the fifth embodiment is a smart phone, the electronic device 50 includes a camera module 51 according to the invention and an electro-optic sensor 52, wherein the camera module 51 can be a camera module in the electronic device of any of the embodiments described above, which includes an imaging lens, but is not limited thereto, and the electro-optic sensor 52 is disposed on an imaging surface (not shown) of the camera module 51. Therefore, the requirements of the market of the electronic devices on the mass production and appearance of the imaging devices mounted on the electronic devices are favorably met.

Further, the user enters the shooting mode through the user interface 58 of the electronic device 50, wherein the user interface in the fifth embodiment may be the touch screen 58a, the buttons 58b, and the like. At this time, the camera module 51 collects the imaging light on the electronic photosensitive element 52, and outputs an electronic Signal related to the Image to an Imaging Signal Processor (ISP) 57.

Referring to fig. 5C, a block diagram of the electronic device 50, particularly a camera in the electronic device 50, is shown in the fifth embodiment. As shown in fig. 5A to 5C, in response to the camera specification of the electronic device 50, the electronic device 50 may further include an auto-focusing assembly 53 and an optical anti-shake assembly 54, and further, the electronic device 50 may further include at least one auxiliary optical element 56 and at least one sensing element 55. The auxiliary optical Element 56 may be a flash module, an infrared ranging Element, a laser focusing module, etc. for compensating color temperature, and the sensing Element 55 may have functions of sensing physical momentum and actuation energy, such as an accelerometer, a gyroscope, a Hall Element (Hall Effect Element), so as to sense shaking and shaking applied by a hand of a user or an external environment, and further enable the auto focusing component 53 and the optical anti-shake component 54 configured in the electronic device 50 to function, so as to obtain good imaging quality, which is helpful for the electronic device 50 according to the present invention to have a shooting function of multiple modes, such as optimizing self-shooting, low light source HDR (High Dynamic Range, High Resolution 4K) recording, etc. In addition, the user can directly visually see the shooting picture of the camera through the touch screen and manually operate the view finding range on the touch screen so as to achieve the WYSIWYG (what you see is what you get) automatic focusing function.

Furthermore, as shown in fig. 5B, the camera module 51, the electronic photosensitive element 52, the auto-focusing assembly 53, the optical anti-shake assembly 54, the sensing element 55 and the auxiliary optical element 56 can be disposed on a Flexible Printed Circuit (FPC) 59a, and electrically connected to the imaging signal processing element 57 and other related elements through a connector 59B to perform the shooting process. The current electronic device such as a smart phone tends to be light and thin, a camera module, an imaging lens and related elements are arranged on a flexible circuit board, and a circuit is integrated to a main board of the electronic device by using a connector, so that the requirements of mechanism design and circuit layout of a limited space in the electronic device can be met, larger margin can be obtained, and the automatic focusing function of the imaging lens can be more flexibly controlled through a touch screen of the electronic device. In the fifth embodiment, the electronic device 50 may include a plurality of sensing elements 55 and a plurality of auxiliary optical elements 56, wherein the sensing elements 55 and the auxiliary optical elements 56 are disposed on the flexible circuit board 59a and at least one other flexible circuit board (not numbered), and are electrically connected to the imaging signal processing element 57 and other related elements through corresponding connectors to perform a shooting process. In other embodiments (not shown), the sensing element and the auxiliary optical element may also be disposed on a motherboard or other types of carrier board of the electronic device according to the mechanical design and circuit layout requirements.

In addition, the electronic device 50 may further include, but is not limited to, a Display Unit (Display), a Control Unit (Control Unit), a Storage Unit (Storage Unit), a Random Access Memory (RAM), a Read Only Memory (ROM), or a combination thereof.

< sixth embodiment >

Referring to fig. 6, a schematic diagram of an electronic device 60 according to a sixth embodiment of the invention is shown. The electronic device 60 according to the sixth embodiment is a tablet computer, and the electronic device 60 includes a camera module 61 according to the invention and an electronic photosensitive element (not shown), wherein the electronic photosensitive element is disposed on an imaging surface (not shown) of the camera module 61, and the camera module 61 includes an imaging lens (not shown) according to the invention.

< seventh embodiment >

Referring to fig. 7, a schematic diagram of an electronic device 70 according to a seventh embodiment of the invention is shown. The electronic device 70 of the seventh embodiment is a wearable device, and the electronic device 70 includes a camera module 71 according to the invention and an electronic photosensitive element (not shown), wherein the electronic photosensitive element is disposed on an imaging surface (not shown) of the camera module 71, and the camera module 71 includes an imaging lens (not shown) according to the invention.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. an imaging lens, is characterized in that, comprises:

a plastic lens barrel; and

an imaging lens group disposed in the plastic lens barrel, the imaging lens group has an optical axis, and includes an object-side lens and an image-side lens, wherein the object-side lens has an outer diameter surface and an optically effective portion, and contains:

a conical collimating surface, which is located on the image-side surface of the object-side lens, and is used for coaxial alignment with the image-side lens;

One is like a side bearing surface;

a parting line having an annular step trace surrounding the optically effective part, wherein the parting line is located between the outer diameter surface and the image-side bearing surface; and

an annular descending surface structure, located between the outer diameter surface and the cone collimating surface;

Wherein, the image-side lens further includes a first descending surface structure, which faces the annular descending surface structure of the object-side lens;

Wherein, the shortest radial distance between the minimum diameter of the cone collimating surface and the outer diameter surface is L1, the depth of a descending surface of the annular descending surface structure parallel to the optical axis is s1, and the first descending surface structure is parallel The depth of a descending plane on the optical axis is s2, which satisfies the following conditions:

0.03mm<L1<0.28mm; and

0.005mm<s1+s2<0.035mm.

2 . The imaging lens of claim 1 , wherein the image-side lens comprises an object-side bearing surface, wherein the image-side bearing surface overlaps with the object-side bearing surface, and the image-side bearing surface The surface is farther from the optically effective portion than the conical collimating surface.

3 . The imaging lens of claim 1 , wherein the depth of the descending surface of the annular descending surface structure parallel to the optical axis is s1 , and the descending surface of the first descending surface structure parallel to the optical axis is s1 . The depth is s2, which satisfies the following conditions:

s1<s2.

4. The imaging lens according to claim 1, wherein the shortest radial distance between the minimum diameter of the conical collimating surface and the outer diameter surface is L1, which satisfies the following conditions:

0.03mm<L1≤0.23mm.

5. The imaging lens of claim 2, wherein the shortest radial distance between the minimum diameter of the conical collimating surface and the optically effective portion is L0, which satisfies the following conditions:

0.2mm<L0.

6. The imaging lens according to claim 2, wherein the outer diameter of the plastic lens barrel closest to the object end is Φoo, which satisfies the following conditions:

1.05mm<Φoo<3.05mm.

7 . The imaging lens of claim 2 , wherein the imaging lens group comprises at least four lenses, the at least four lenses comprises the object-side lens and the image-side lens, wherein the most of the at least four lenses is the most The lens near the image side has a thickness that varies from small to large and then small from the center to the edge.

8 . The imaging lens of claim 2 , wherein the depth of the descending surface of the annular descending surface structure parallel to the optical axis is s1 , and the descending surface of the first descending surface structure parallel to the optical axis is s1 . The depth is s2, which satisfies the following conditions:

0.005mm<s1+s2<0.02mm.

9 . The imaging lens of claim 2 , wherein the depth of the descending surface of the annular descending surface structure parallel to the optical axis is s1 , and the descending surface of the first descending surface structure parallel to the optical axis is s1 . The depth is s2, which satisfies the following conditions:

s1<s2.

10 . The imaging lens of claim 9 , wherein the depth of the drop surface of the annular drop surface structure parallel to the optical axis is s1 , which satisfies the following conditions: 11 .

s1<0.015mm.

11 . The imaging lens of claim 10 , wherein the depth of the drop surface of the annular drop surface structure parallel to the optical axis is s1 , which satisfies the following conditions: 11 .

s1<0.01mm.

12 . The imaging lens of claim 3 , wherein the depth of the drop surface of the annular drop surface structure parallel to the optical axis is s1 , which satisfies the following conditions: 13 .

s1<0.01mm.

13 . The imaging lens of claim 4 , wherein the depth of the drop surface of the annular drop surface structure parallel to the optical axis is s1 , which satisfies the following conditions: 14 .

s1<0.015mm.

14. The imaging lens of claim 4, wherein the shortest radial distance between the minimum diameter of the conical collimating surface and the optically effective portion is L0, which satisfies the following conditions:

0.2mm<L0.

15 . The imaging lens of claim 4 , wherein the imaging lens group comprises at least four lenses, the at least four lenses comprises the object-side lens and the image-side lens, wherein the most of the at least four lenses is the most The lens near the image side has a thickness that varies from small to large and then small from the center to the edge.

16. The imaging lens of claim 1, wherein the outer diameter of the plastic lens barrel closest to the object end is Φoo, which satisfies the following conditions:

1.05mm<Φoo<3.05mm.

17. The imaging lens of claim 1, wherein the angle between the conical collimating surface and the optical axis is θ, which satisfies the following conditions:

2 degrees < θ < 30 degrees.

18. A camera module, comprising:

The imaging lens of claim 1.

19. An electronic device, characterized in that, comprising:

The camera module of claim 18; and

An electronic photosensitive element is arranged on an imaging surface of the camera module.

20. The electronic device according to claim 19, wherein the pixel size of the electronic photosensitive element is p, which satisfies the following conditions:

0.1um<p<0.95um.

21. An imaging lens, characterized in that, comprising:

a plastic lens barrel; and

a conical collimating surface, which is located on the image-side surface of the object-side lens and is used for coaxial alignment with the image-side lens;

One is like a side bearing surface;

0.03mm<L1<0.28mm; and

s1<s2.